package com.woniuxy.shop.web;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class UserFilter
 */
@WebFilter(urlPatterns = {"/cart.jsp"})
public class UserFilter implements Filter {

    @Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse resp = (HttpServletResponse)response;
		//判断是否有登录
		if(req.getSession().getAttribute("user")==null) {
			//没有则进入登录界面
			resp.sendRedirect("usernotlogin.jsp");
			return;
		}
		chain.doFilter(request, response);
	}

	
}
